# let – Simple calculator that performs arithmetic expressions

The `let` command is a simple calculator that performs arithmetic expressions in Linux. It evaluates the expression and prints the result to the terminal.

## Overview

The `let` command can be used to perform arithmetic operations such as addition, subtraction, multiplication, and division. It can also be used to perform bitwise operations, logical operations, and comparisons.

The syntax for using `let` is as follows:

``````let expression
``````

Where `expression` is the arithmetic expression that you want to evaluate.

### Examples

``````let a=10
let b=20
let c=a+b
echo \$c
``````

Output:

``````30
``````

#### Subtraction

``````let a=20
let b=10
let c=a-b
echo \$c
``````

Output:

``````10
``````

#### Multiplication

``````let a=5
let b=6
let c=a*b
echo \$c
``````

Output:

``````30
``````

#### Division

``````let a=20
let b=5
let c=a/b
echo \$c
``````

Output:

``````4
``````

#### Bitwise Operations

``````let a=5
let b=3
let c=a&b
echo \$c
``````

Output:

``````1
``````

#### Logical Operations

``````let a=5
let b=3
let c=a==b
echo \$c
``````

Output:

``````0
``````

#### Comparisons

``````let a=5
let b=3
let c=a>b
echo \$c
``````

Output:

``````1
``````

## Options

The `let` command does not have any options.

## Troubleshooting tips

• Make sure that you are using the correct syntax for the arithmetic expression.
• Check that you have assigned values to all the variables used in the expression.
• Ensure that there are no typos or syntax errors in the expression.

## Notes

• The `let` command can only be used to perform integer arithmetic operations.
• If you need to perform floating-point arithmetic operations, you should use a different command such as `bc`.